This is a 1945 propaganda film. That context matters before anything else. What you're actually watching is state machinery using folklore and musical numbers to sell a war that Japan was already losing. The "liberation" framing is historically false, the animals singing AIUEO is surreal enough to crack the propaganda apart from the inside, and treating it as historical artifact rather than entertainment is the only honest approach. It exists as proof of what animation was conscripted to do when governments had total control over what got made.
Momotaro, the legendary peach boy of Japanese folklore, leads a regiment of animal soldiers on a dangerous military operation. Their target: a strategic island in the Pacific theater where enemy forces hold ground. What begins as a covert insertion becomes something far more ambitious, as Momotaro's unconventional army works to secure the region and establish control over the territory. The film balances combat sequences with unexpected moments of levity. Musical numbers punctuate the action, including a peculiar scene where Japanese soldiers teach local wildlife to speak, turning animals into willing participants in the broader campaign. These lighter touches create an odd tonal mix against the backdrop of active warfare. This is propaganda filmmaking at its most surreal. The narrative frames military conquest through the lens of folklore and children's entertainment, transforming soldiers into heroes of a storybook war. The result feels both earnest and deeply strange to modern eyes, blending military ambition with whimsical imagery in ways that reflect its specific historical moment. Viewers interested in how wartime cinema shaped national narratives will find it particularly fascinating.